Imagine a gyroplane, if something happen mid-flight (when the plane is basically an autogyro and the engine provides no power to the helicopter rotor) and just the wind generated by forward flight can no longer turn the helicopter rotor enough to provide enough lift, could the engine partially take over? Like using the engine to provide just enough power, with the rest provided by the wind, so the helicopter rotor could spin enough?
I don't want the plane to autorotate downward. I want the plane to keep flying, but using the engine to increase the rpm. If the incoming wind could turn the top rotor in a certain rpm, could we increase the rpm using the engine? In my memory, rotodyne could do this because it uses a tip jet, but what if we use normal piston or turbine engine?